A repeat of Sunday’s premiere of “Charlie Sheen: On the Brink” airs tonight, with a look back on the actor’s career, marriages and meltdowns. NBC News’ reporter Jeff Rossen shares his recent exclusive interviews with Sheen and never-before-seen footage inside Sheen’s mansion. Rated TV-14.

Weekend tip: Sunday night is Earth Hour

Saturday night at 8:30 is the beginning of Earth Hour, a time when people are encouraged to turn off the lights in their homes and businesses to save electricity. So light some candles, get romantic and just relax. Or gather the family around a candle-lit “bonfire” and tell scary stories. For more ideas and information, go to www.MyEarthHour.org.